Ultra-narrow-band terahertz perfect metamaterial absorber for refractive index sensing application

Results in Physics

Tianhua Meng¹  Hongyan Wang²  Yongkang Ma³  Qiaofen Zhu⁴  Dan Hu⁴ 

[1] Corresponding author.;Department of Physics and Electronics Science, Shanxi Datong University, Datong Shanxi 037009, China;School of Education Information Technology and Communication, Anyang Normal University, Anyang 455000, China;School of Physics and Electrical Engineering, Anyang Normal University, Anyang 455000, China;

关键词: Ultra-narrow-band;    Terahertz;    Metamaterial;    Absorber;    Sensor;   

DOI  :  

来源: DOAJ

【 摘 要 】

We numerically propose and demonstrate an ultra-narrow perfect metamaterial absorber (PMA) for refractive index sensing applications in the terahertz region. The designed PMA is only composed of a gallium arsenide (GaAs) cross-shaped resonator array on an opaque copper/silicon substrate. Simulated results show that the proposed PMA can achieve a near-perfect absorption peak with an absorptivity of 99.49% and a high quality factor value of 637 at 2.44THz. The physical mechanism of the narrow absorption is explained by the electric field, magnetic field and Poynting vector distributions. As a refractive index sensor, its sensitivity and figure of merit reach up to 1.94THz/refractive index unit (RIU) and 506RIU−1, respectively. These results make the proposed PMA to have great potential in detecting, imaging and sensing applications.

【 授权许可】

Unknown